The Library of Congress announced the creation of a new blog this week, to which I've added a link on the sidebar. AHA Today notes "Matt Raymond, the director of communications at the LOC, will be the main writer on the blog, but some posts will come from James H. Billington, the Librarian of Congress, along with other curators at the institution."
So far, the posts are quite interesting and relevant, and I look forward to many more.